Use gst.DeviceMonitor to list video sources. #128
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The current code list devices under
/sys/class/video4linux, however some other devices (such as my touchpad) appear there. By using Gst.DeviceMonitor we can filter only devices that have thevideo/x-rawcapability, resulting in simpler code and better detection (at least in my setup). This could also pave the path for implementing #59 and #41 , since we could add a watch to detect when new devices are added or removed and update the GUI and camera_view appropriately.